anti-shoplifting devices more common
Radio-Frequency Identification tags (RFID) are making their way into more products in an effort to cut down on shoplifting. We've seen this type of technology used on cds in music stores for a few years. The tags are being hidden in new places, like the soles of shoes, or the lining of clothes. There's a pretty good section describing "source-tagging" and other anti-shoppinglifting devices on the Howstuffworks pages.